What structure covers the ends of bones at a joint to protect them?

The correct response highlights the role of cartilage in the joint structure. Cartilage is a smooth, flexible tissue that covers the ends of bones at joints, providing a cushion that absorbs shock and reduces friction during movement. This protective layer enables smooth gliding of the bone surfaces against each other, preventing wear and tear and contributing to the overall function of the joint.

In addition to its protective qualities, cartilage is essential for maintaining joint stability and promoting healthy movement. It can withstand compression and tensile forces, making it a vital component in the musculoskeletal system.

The other options, while related to joints, serve different functions. Meniscus refers specifically to the crescent-shaped cartilage structure found in certain joints like the knee, providing additional cushioning and support but not directly covering bone ends in all joints. Tendons are fibrous tissues that connect muscles to bones, and while they play a role in movement, they do not cover bone ends. Ligaments are connective tissues that connect bones to other bones at joints, stabilizing them but not providing the cushioning and protective function that cartilage does.